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L9963T Datasheet(PDF) 30 Page - STMicroelectronics |
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L9963T Datasheet(HTML) 30 Page - STMicroelectronics |
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30 / 45 page  Symbol Parameters Test condition Min Typ Max Unit VCM_ISO_IN = 0 V , VCM_ISO_IN = 1.4 V 3.4.4.1.2 ISO communicator transmitter The transmitter is able to translate a single ended logic signal into a differential one output on the ISOP-ISOM pins. Bit symbols are shown in Figure 15. Transmitter output impedance can be programmed via TXAMP pin among RDIFF_ISO_OUTL and RDIFF_ISO_OUTH values. It affects transmitted pulse amplitude, as described in TXAMPdedicated paragraph. In order to work properly, the transmitter needs to be terminated with an RISO_EXT resistor connected between ISOP and ISOM pins. This allows generating differential signals with an amplitude suitable to be interpreted by the ISO Communicator Receiver. 3.4.4.1.2.1 Electrical parameters - ISO transmitter All parameters are tested and guaranteed in the following conditions, unless otherwise specified: 4.5 V ≤ VVDD ≤ 5.5 V ; -40 °C < Tambient < 105 °C Table 25. Isolated transmitter electrical parameters Symbol Parameters Test condition Min Typ Max Unit RDIFF_ISO_OUTL Total output resistance: sum of pull up and pull down resistance contribution Rpullup measured with VCM_ISO_IN = 1.5 V Rpulldown measured with VCM_ISO_IN = 0.9 V TXAMP = 0 310 440 570 Ω RDIFF_ISO_OUTH Rpullup measured with VCM_ISO_IN = 1.5 V Rpulldown measured with VCM_ISO_IN = 0.9 V TXAMP = 0 170 244 310 Ω VCM_ISO_OUT Output voltage common mode |V(ISOP) + V(ISOM)|/2 1 - 1.4 V TBIT_HIGH_LOW_FAST High/low level bit duration into a whole period in case of high frequency configuration Guarantee by SCAN - 62.5 - ns TBIT_HIGH_LOW_SLOW High/low level bit duration into a whole period in case of low frequency configuration Guarantee by SCAN - 500 - ns TBIT_LENGTH_FAST Bit duration with high frequency configured Guarantee by SCAN - 375 - ns TBIT_LENGTH_SLOW Bit duration with low frequency configured Guarantee by SCAN - 3 - μs FISO_FAST Isolated Communication Rate ISOFREQ = 1 Application info - 2.66 - Mbps FISO_SLOW Isolated Communication Rate ISOFREQ = 0 Application info - 333.3 - Kbps 3.5 Safety and diagnostic features This paragraph lists all the safety mechanisms implemented in L9963T. 3.5.1 Bandgap monitor Two BG references are used, to guarantee independency between monitor functions. In case a BG shifts in respect to the other, the device is kept under POR. L9963T Safety and diagnostic features DS13590 - Rev 4 page 30/45 |
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